RFR: 8289763: Remove NULL check in CDSProtectionDomain::init_security_info()

[Calvin Cheung]

On Tue, 5 Jul 2022 18:28:11 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> Please review this trivial clean up. I removed the unnecessary NULL check, and replaced the `CHECK_(pd)` with `CHECK_NH` to make the code cleaner.
> 
> It's easier to view the changes by ignoring whitespace differences.

Marked as reviewed by ccheung (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/9380